CN111896839A - Platform and method for testing current-carrying capacity of submarine cable in temperature field - Google Patents
Platform and method for testing current-carrying capacity of submarine cable in temperature field Download PDFInfo
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- CN111896839A CN111896839A CN202010677032.0A CN202010677032A CN111896839A CN 111896839 A CN111896839 A CN 111896839A CN 202010677032 A CN202010677032 A CN 202010677032A CN 111896839 A CN111896839 A CN 111896839A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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Abstract
The invention provides a submarine cable temperature field current-carrying capacity testing platform and method, and belongs to the field of cable testing. This test platform includes: the water tank is internally provided with soil and seawater, and the bottom of the water tank is provided with at least one pair of jacks for plugging cables to be tested at positions corresponding to the soil; the output end of the booster pump is positioned between the top of the soil and the inner wall of the top of the water tank; the heater is positioned in seawater; the calandria is used for being sleeved on the cable to be tested; the large-current generator is used for being electrically connected with the cable to be tested; the first optical fiber sensor is positioned in the cable to be detected and in the soil; the second optical fiber sensor is positioned in seawater; and the third optical fiber sensor is positioned in the cable to be tested and is positioned in the calandria. And the industrial control computer with LabVIEW software is used for controlling the booster pump, the heater, the large current generator and the like. The current-carrying capacity of the tested submarine cable can meet the actual working condition.
Description
Technical Field
The disclosure belongs to the field of cable testing, and particularly relates to a platform and a method for testing current-carrying capacity of a submarine cable temperature field.
Background
The carrying capacity is an important parameter of the submarine cable, and provides theoretical technical support for submarine cable laying. The current carrying capacity of a submarine cable means the maximum current that the submarine cable can continuously carry under specified conditions without causing the stable temperature of the submarine cable to exceed a specified value.
In the related art, an analytic solution is commonly used to test the current carrying capacity of the submarine cable. The analytic solution method is to convert the heat transfer problem of the submarine cable into the circuit problem of the submarine cable, so that the current-carrying capacity of the submarine cable is calculated through the analytic circuit.
However, the analytic solution method cannot simulate the complicated laying condition of the submarine cable, so that the calculated current-carrying capacity has a large deviation from the current-carrying capacity under the actual condition.
Disclosure of Invention
The embodiment of the disclosure provides a platform and a method for testing the current-carrying capacity of a submarine cable temperature field, which can enable the current-carrying capacity of the tested submarine cable to meet the actual working condition. The technical scheme is as follows:
on the one hand, this disclosed embodiment provides a test platform of submarine cable temperature field ampacity, its characterized in that includes:
the cable testing device comprises a water tank, a testing device and a testing device, wherein soil and seawater are arranged in the water tank, the soil is positioned at the bottom of the water tank, at least one pair of jacks for inserting a cable to be tested are arranged at the position, corresponding to the soil, of the bottom of the water tank, and the seawater is positioned between the top of the soil and the inner wall of the top of the water tank;
the output end of the booster pump is positioned between the top of the soil and the inner wall of the top of the water tank;
a heater located in the seawater;
the calandria is used for being sleeved on the cable to be tested;
the large-current generator is used for being electrically connected with the cable to be tested;
the first optical fiber sensor is positioned in the cable to be measured and in the soil, and is used for measuring the temperature and the pressure of the cable to be measured in the soil;
a second fiber optic sensor located in the seawater for measuring temperature and pressure in the seawater;
and the third optical fiber sensor is positioned in the cable to be tested and in the calandria, and is used for measuring the temperature and the pressure of the cable to be tested in the calandria.
Optionally, the bottom of the water tank is provided with a plurality of pairs of insertion holes for inserting the cable to be tested at positions corresponding to the soil, the axes of each pair of insertion holes are parallel to each other, and each pair of insertion holes are sequentially arranged along a direction perpendicular to the horizontal plane.
Optionally, the bottom of the water tank is provided with a plurality of pairs of insertion holes for inserting the cable to be tested at positions corresponding to the soil, the axes of each pair of insertion holes are parallel to each other, and each pair of insertion holes are sequentially arranged along a direction perpendicular to the horizontal plane.
Optionally, the test platform further includes a main optical fiber, the main optical fiber and the cable to be tested are laid together, and the first optical fiber sensor, the second optical fiber sensor and the third optical fiber sensor are all connected to the main optical fiber.
Optionally, the test platform further comprises a blower for blowing air to the inside of the gauntlet.
Optionally, the fan is a centrifugal fan, and an air outlet of the fan is communicated with the end opening of the discharge pipe.
On the other hand, the embodiment of the present disclosure provides a method for testing current-carrying capacity of a submarine cable temperature field, where the method is based on the above test platform, and the method includes:
penetrating the cable to be tested through the jack to be laid in soil;
sleeving the calandria on the cable to be tested outside the water tank;
determining the working condition pressure and the working condition temperature of the cable;
the pressure of the seawater is boosted to the working condition pressure of the cable by the booster pump, and the temperature of the seawater is increased to the working condition temperature of the cable by the heater;
and increasing the current value borne by the cable to be tested through the large current generator until the temperature of the cable to be tested is increased to the maximum allowable temperature, and determining the current value at the moment as the current-carrying capacity of the cable to be tested.
Optionally, the passing the cable to be tested through the jack for laying in the soil includes:
providing a plurality of cables to be tested;
and respectively penetrating the cables to be tested through different jacks, so that the parts of the cables to be tested in the water tank are mutually spaced and parallel, and the arrangement direction of the cables to be tested is vertical to the horizontal plane.
Optionally, the providing a plurality of cables to be tested includes:
and providing a plurality of cables to be tested with different lengths.
Optionally, the testing method further comprises:
mounting a fan to a position proximate to the bank pipe such that an air outlet of the fan is open to an end of the bank pipe;
determining the working condition and wind speed of the cable;
and adjusting the wind speed in the calandria to the working condition wind speed of the cable through the fan.
Optionally, after the current value carried by the cable to be tested is increased by the high-current generator, the testing method further includes:
and if the change rate of the temperature of the cable to be tested in each hour is greater than the change threshold, continuously increasing the current value borne by the cable to be tested until the temperature of the cable to be tested is increased to the maximum allowable temperature.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
when testing the current-carrying capacity of submarine cable through the test platform that this disclosed embodiment provided, at first pass through jack cartridge to the water tank with the cable that awaits measuring for the cable is arranged in earth, thereby simulates the environment that the cable that awaits measuring laid at the submarine section. And then the calandria is sleeved on the cable to be tested outside the water tank, so as to simulate the environment of laying the cable to be tested in the landing section. Then the pressure of the seawater is boosted to the working condition pressure of the cable through the booster pump, the temperature of the seawater is increased to the working condition temperature of the cable through the heater, and the working condition pressure of the cable and the working condition temperature of the cable are both corresponding actual working conditions when the submarine cable is laid on the seabed. And moreover, the working condition pressure and the working condition temperature of the cable can be monitored in real time through the second optical fiber sensor. And finally, increasing the current value borne by the cable to be tested through the large current generator until the temperature of the cable to be tested is increased to the maximum allowable temperature. In the process, the temperature of the cable to be measured can be monitored by the first optical fiber sensor and the third optical fiber sensor. And when the temperature of the cable to be tested is stabilized at the highest allowable temperature, the current value borne by the submarine cable is the current-carrying capacity of the cable to be tested.
That is to say, because when the test platform provided by the embodiment of the present disclosure is used for testing the current-carrying capacity of the submarine cable, the actual working condition of the submarine cable is simulated, so that the current-carrying capacity of the tested submarine cable can meet the actual working condition.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic construction diagram of a platform for testing the current-carrying capacity of a submarine cable in a temperature field according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for testing current carrying capacity of a submarine cable temperature field according to an embodiment of the present disclosure;
fig. 3 is a flowchart of another method for testing current carrying capacity of a submarine cable temperature field according to an embodiment of the present disclosure.
The symbols in the drawings represent the following meanings:
1. a water tank; 11. soil; 12. seawater; 13. a jack; 2. a booster pump; 3. a heater; 4. arranging pipes; 5. a large current generator; 61. a first fiber optic sensor; 62. a second optical fiber sensor; 63. a third optical fiber sensor; 7. a main optical fiber; 8. a fan; 9. controlling an industrial personal computer; 100. and (6) a cable to be tested.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
The disclosed embodiment provides a submarine cable temperature field current-carrying capacity test platform, which comprises a water tank 1, a booster pump 2, a heater 3, a discharge pipe 4, a large current generator 5, a first optical fiber sensor 61, a second optical fiber sensor 62 and a third optical fiber sensor 63, as shown in fig. 1. Have earth 11 and sea water 12 in the water tank 1, earth 11 is located the bottom of water tank 1, and the position that the bottom of water tank 1 corresponds earth 11 has at least a pair of jack 13 that is used for cartridge cable 100 that awaits measuring, and sea water 12 is located between the top of earth 11 and the top inner wall of water tank 1. The output end of the booster pump 2 is located between the top of the soil 11 and the top inner wall of the water tank 1. The heater 3 is located in the sea water 12. The calandria 4 is used for being sleeved on the cable 100 to be tested. The high current generator 5 is used for electrically connecting with the cable 100 to be tested. The first optical fiber sensor 61 is located in the cable 100 to be measured and located in the soil 11, and the first optical fiber sensor 61 is used for measuring the temperature and the pressure of the cable 100 to be measured in the soil 11. A second fiber optic sensor 62 located in the seawater 12, the second fiber optic sensor 62 for measuring temperature and pressure in the seawater 12. And a third optical fiber sensor 63 located in the cable 100 to be measured and in the rack pipe 4, wherein the third optical fiber sensor 63 is used for measuring the temperature and the pressure of the cable 100 to be measured in the rack pipe 4.
When testing the current-carrying capacity of submarine cable through the test platform that this disclosed embodiment provided, at first in inserting the cable 100 that awaits measuring to water tank 1 through jack 13 for the cable is arranged in earth 11, thereby the environment that simulation cable 100 that awaits measuring laid at the submarine section. And then the calandria 4 is sleeved on the cable 100 to be tested outside the water tank 1, so as to simulate the environment of laying the cable 100 to be tested in the landing section. Then the pressure of the seawater 12 is boosted to the working condition pressure of the cable through the booster pump 2, the temperature of the seawater 12 is increased to the working condition temperature of the cable through the heater 3, and the working condition pressure of the cable and the working condition temperature of the cable are both the actual working conditions corresponding to the cable 100 to be tested when the cable is laid on the seabed. Moreover, the cable working condition pressure and the cable working condition temperature can be monitored in real time through the second optical fiber sensor 62. And finally, increasing the current value borne by the cable 100 to be tested through the large current generator 5 until the temperature of the cable 100 to be tested is increased to the maximum allowable temperature. In this process, the temperature of the cable 100 to be measured can be monitored by the first optical fiber sensor 61 and the third optical fiber sensor 63. When the temperature of the cable 100 to be tested is stabilized at the maximum allowable temperature, the current value carried by the submarine cable is the current-carrying capacity of the cable 100 to be tested.
That is to say, because when the test platform provided by the embodiment of the present disclosure is used for testing the current-carrying capacity of the submarine cable, the actual working condition of the submarine cable is simulated, so that the current-carrying capacity of the tested submarine cable can meet the actual working condition.
The water tank 1 will now be described, with continued reference to fig. 1:
in this embodiment, the water tank 1 may include a tank body having an opening and a top cover on the top of the tank body, and the top cover is turnably mounted on the top of the tank body through a rotation shaft. The opening of the water tank 1 can be opened by turning over the top cover, so that the addition or replacement of the seawater 12 and the soil 11 can be facilitated. When the test platform works, the top cover seals the opening of the main water tank 1, so that the top cover can be matched with the booster pump 2 to realize the adjustment of the internal pressure of the water tank 1.
Optionally, in order to facilitate observation of the submarine cable test, the box body and the top cover can be transparent structural members.
In addition, in order to facilitate the pressurizing pump 2 to pressurize the seawater 12, the top cover may have a hole for inserting a pressurizing pipe. The booster pump 2 is positioned outside the tank body, the output end of the booster pump 2 is communicated with one end of the pressurizing pipe, and the other end of the pressurizing pipe penetrates through the hole to be positioned in the water tank 1, so that the seawater 12 is pressurized.
Illustratively, the booster pump 2 may be a water pump or an air pump, so that the pressure of the seawater 12 may be increased.
Similarly, in order to facilitate the heater 3 to heat the seawater 12, the top cover may have a hole for inserting the electric wire of the heater 3. The heater 3 is positioned in the box body, and the electric wire of the heater 3 passes through the hole to be connected with a power supply positioned outside the water tank 1, so that the power supply for the heater 3 is realized.
The heater 3 may be an electric heating tube, for example, so that the temperature of the seawater 12 may be increased.
With continued reference to fig. 1, in the present embodiment, the bottom of the water tank 1 has a plurality of pairs of insertion holes 13 corresponding to the positions of the soil 11 for inserting the cables 100 to be tested, the axes of each pair of insertion holes 13 are parallel to each other, and each pair of insertion holes 13 are sequentially arranged along a direction perpendicular to the horizontal plane.
The pair of insertion holes 13 includes two insertion holes 13 arranged oppositely and coaxially. Therefore, a plurality of cables 100 to be tested can be inserted into the water tank 1, so that the load capacity of the plurality of cables 100 to be tested can be tested, and more comprehensive theoretical technical support is provided for submarine cable laying. Of course, since each pair of insertion holes 13 are located at different depths, the depth of the cable 100 to be tested in the soil 11 can be changed by inserting the cable 100 to be tested into the different insertion holes 13.
Moreover, because the axes of each pair of insertion holes 13 are parallel to each other, the parts of the cables 100 to be tested in the water tank 1 are spaced from each other and are parallel to each other, and mutual influence between the cables 100 to be tested is avoided.
Generally, the laying depth of the submarine cable on the seabed is generally 1-3m, and if three cables 100 to be tested are inserted into the water tank 1, the three cables 100 to be tested are respectively located at 1m, 2m and 3m in the soil 11. Of course, the number and the laying depth of the cables 100 to be tested can be adjusted according to actual requirements, and the disclosure does not limit this.
The following describes the installation manner of the cable 100 to be tested in the water tank 1 with reference to the structure of the water tank 1:
firstly, each cable 100 to be tested is inserted into the water tank 1 through each pair of insertion holes 13.
Then, the top cover is opened, and a proper amount of soil 11 and seawater 12 are sequentially added into the box body. Since the cable 100 to be tested is inserted into the insertion hole 13, the soil 11 does not leak out of the insertion hole 13.
Finally, the top cover is closed, and the installation of the cable 100 to be tested in the water tank 1 is completed.
In this embodiment, the testing platform further includes a main optical fiber 7, the main optical fiber 7 and the cable 100 to be tested are laid together, and the first optical fiber sensor 61, the second optical fiber sensor 62 and the third optical fiber sensor 63 are all connected to the main optical fiber 7.
In the above implementation manner, the main optical fiber 7 is used to transmit the information monitored by the first optical fiber sensor 61, the second optical fiber sensor 62 and the third optical fiber sensor 63, so as to summarize the information, and the test platform can conveniently collect the monitored information.
Alternatively, the first optical fiber sensor 61, the second optical fiber sensor 62 and the third optical fiber sensor 63 may be the same, and are all four-core composite optical fibers, and two ends of each four-core composite optical fiber are provided with optical fiber signal demodulators. Two of the four-core composite fibers are used for monitoring temperature, and the other two are used for detecting pressure.
In addition, the test platform comprises an industrial control computer 9 controlled by LabVIEW program control software, wherein the industrial control computer 9 comprises a parameter setting module and a communication module, and the parameter setting module is used for setting parameters such as the temperature and the pressure of the seawater 12 and the current amount carried by the cable 100 to be tested. The communication module is used for realizing communication among all the components. For example, the communication module utilizes a VISA instrument communication module to complete information interaction with the main optical fiber 7 through an RS-232 serial port.
In this embodiment, the test platform further comprises a fan 8, the fan 8 being adapted to blow air towards the inside of the gauntlet 4.
In the above implementation, the fan 8 is used to simulate the ventilation condition in the exhaust pipe 4, so as to better simulate the environment where the cable 100 to be tested is laid in the landing section.
Since the third optical fiber sensor 63 cannot directly detect the wind speed in the pipe 4, the wind speed in the pipe 4 needs to be converted by the pressure in the pipe 4 detected by the third optical fiber sensor 63. It is easy to understand that the pressure in the gauntlet tube 4 has a certain functional relationship with the wind speed, for example the higher the pressure in the gauntlet tube 4, the higher the wind speed in the gauntlet tube 4, whereas the lower the pressure in the gauntlet tube 4, the lower the wind speed in the gauntlet tube 4.
Optionally, the fan 8 is a centrifugal fan 8, and an air outlet of the fan 8 is communicated with the end opening of the discharge pipe 4. This prevents the air from escaping from the fan 8 and thus allows better control of the speed of the air in the exhaust pipe 4.
Fig. 2 is a flowchart of a method for testing current-carrying capacity of a submarine cable temperature field according to an embodiment of the present disclosure, and with reference to fig. 2, the method is applied to the test platform shown in fig. 1, and the method includes:
step 201: the cable 100 to be tested is passed through the insertion hole 13 to be laid in the soil 11.
Step 202: the calandria 4 is sleeved on the cable 100 to be tested outside the water tank 1.
Step 203: and determining the working condition pressure and the working condition temperature of the cable.
Step 204: the pressure of the seawater 12 is boosted to the working condition pressure of the cable by the booster pump 2, and the temperature of the seawater 12 is increased to the working condition temperature of the cable by the heater 3.
Step 205: and increasing the current value carried by the cable 100 to be tested through the large current generator 5 until the temperature of the cable 100 to be tested is increased to the maximum allowable temperature, and determining the current value at the moment as the current-carrying capacity of the cable 100 to be tested.
That is to say, according to the testing method provided by the embodiment of the disclosure, when the current-carrying capacity of the submarine cable is tested based on the testing platform, the actual working condition of the submarine cable can be simulated, so that the current-carrying capacity of the tested submarine cable can meet the actual working condition.
Fig. 3 is a flowchart of another method for testing the current-carrying capacity of the submarine cable in the temperature field according to an embodiment of the present disclosure, and with reference to fig. 3, the method is suitable for the test platform shown in fig. 1, and the method includes:
step 301: the cable 100 to be tested is passed through the insertion hole 13 to be laid in the soil 11.
In the above implementation, the cable 100 to be tested is laid in the soil 11, so as to simulate the environment in which the cable 100 to be tested is laid in the seabed section.
In this embodiment, step 301 may be implemented by:
first, a plurality of cables 100 to be tested are provided.
Then, the cables 100 to be tested are respectively passed through different insertion holes 13, so that the portions of the cables 100 to be tested in the water tank 1 are spaced and parallel to each other, and the arrangement direction of the cables 100 to be tested is perpendicular to the horizontal plane.
In the above implementation, since the arrangement direction of each cable 100 to be tested is perpendicular to the horizontal plane, the depths of the cables 100 to be tested in the soil 11 are different from each other. Therefore, the current-carrying capacity of the cables 100 to be tested at different depths can be obtained through one test, so that the test efficiency is improved, and more comprehensive theoretical technical support is provided for submarine cable laying.
Moreover, because the parts of the cables 100 to be tested in the water tank 1 are spaced and parallel to each other, and mutual influence among the cables 100 to be tested is avoided.
In addition, a plurality of cables to be tested 100 with different lengths can be provided, so that the influence of the lengths on the current-carrying capacity of the cables to be tested 100 can be studied.
Step 302: the calandria 4 is sleeved on the cable 100 to be tested outside the water tank 1.
In the implementation manner, the pipe 4 is sleeved on the cable 100 to be tested outside the water tank 1, so as to simulate the environment of the cable 100 to be tested in the laying section.
Step 303: the fan 8 is mounted to a position close to the discharge tube 4 so that the air outlet of the fan 8 is open towards the end of the discharge tube 4.
In the above implementation, the fan 8 is used to simulate the ventilation condition in the exhaust pipe 4, so as to better simulate the environment where the cable 100 to be tested is laid in the landing section.
Step 304: and determining the working condition pressure of the cable, the working condition temperature of the cable and the working condition wind speed of the cable.
The cable working condition pressure refers to the pressure of the cable 100 to be tested under the actual working condition, the cable working condition temperature refers to the temperature of the cable 100 to be tested under the actual working condition, and the cable working condition wind speed refers to the wind speed of the cable 100 to be tested under the actual working condition. Through the three parameters, the actual working condition of the cable 100 to be tested can be effectively simulated, so that the current-carrying capacity obtained by subsequent detection can be close to the current-carrying capacity under the actual working condition.
Step 305: the pressure of the seawater 12 is pressurized to the working condition pressure of the cable through the booster pump 2, the temperature of the seawater 12 is increased to the working condition temperature of the cable through the heater 3, and the air speed in the exhaust pipe 4 is adjusted to the working condition air speed of the cable through the fan 8.
In the implementation manner, the booster pump 2 can adjust the pressure of the seawater 12, so that the test platform can truly simulate the pressure of the cable 100 to be tested under the actual working condition. Through the heater 3, the adjustment of the temperature of the seawater 12 can be realized, so that the test platform can truly simulate the temperature of the cable 100 to be tested under the actual working condition. Through the fan 8, the wind speed in the calandria 4 can be adjusted, so that the test platform can truly simulate the wind speed of the cable 100 to be tested under the actual working condition.
That is, the cable 100 to be tested can be tested by a controlled variable method according to relevant specification requirements by comprehensively considering relevant influence factors on the submarine cable such as the temperature of the seawater 12, the pressure of the seawater 12, the laying depth of the submarine cable, the wind speed in the calandria 4 and the like.
Optionally, the booster pump 2, the heater 3 and the fan 8 are controlled to work by an industrial control computer 9 with a LabVIEW program, so that the pressure of the seawater 12 is boosted to the working condition pressure of the cable, the temperature of the seawater 12 is increased to the working condition temperature of the cable, and the fan 8 adjusts the wind speed in the calandria 4 to the working condition wind speed of the cable. The dynamic link Library file "FilterWheel 102_ wind 32. dll" provided by the merchant is called through the Call Library function node (CLN) node in LabVIEW program control; the control of the booster pump 2, the heater 3 and the fan 8 is achieved by functions in dll files.
Step 306: the current value carried by the cable 100 to be tested is increased by the high-current generator 5.
In the above implementation, the large current generator 5 is used to gradually increase the current value carried by the cable 100 to be tested, so that the temperature of the cable 100 to be tested can be gradually increased to the maximum allowable temperature. The maximum allowable temperature refers to the maximum temperature that the cable 100 under test can reach under relevant specification requirements. By testing the current value of the cable 100 to be tested with the highest allowable temperature, the current-carrying capacity of the cable 100 to be tested can be obtained.
Illustratively, the maximum allowable temperature is 90 ℃. The value can be adjusted according to actual requirements, and the disclosure does not limit the value.
Optionally, the control of the output current of the large current generator 5 is realized by LabVIEW program control software and an arduinoouno single chip microcomputer. The output current control program of the large current generator 5 can realize the communication between the LabVIEW and the Arduino Uno singlechip through the LabVIEW Interface for the Arduino. LabVIEW interface for Arduino is installed in LabVIEW, and then lifa _ base.ino is recorded into the Arduino Uno singlechip, so that the LabVIEW can control the Arduino Uno singlechip through a VISA instrument communication module. The Arduino Uno singlechip is subjected to closed-loop negative feedback program input, so that the large-current generator 5 can be controlled, the output current of the large-current generator 5 is controlled by a LabVIEW program, and the current value borne by the cable 100 to be tested is improved.
Step 307: and judging whether the change rate of the temperature of the cable 100 to be tested in each hour is greater than a change threshold, and if the change rate of the temperature of the cable 100 to be tested in each hour is greater than the change threshold, continuously increasing the current value borne by the cable 100 to be tested until the temperature of the cable 100 to be tested is increased to the maximum allowable temperature. If the change rate of the temperature of the cable 100 to be tested in each hour is not greater than the change threshold, the current value borne by the cable 100 to be tested is continuously increased after the change rate of the temperature of the cable 100 to be tested in each hour is greater than the change threshold until the temperature of the cable 100 to be tested is increased to the maximum allowable temperature.
In the implementation manner, before the temperature of the cable 100 to be tested is increased to the maximum allowable temperature, it is further required to determine whether the temperature change of the cable 100 to be tested is stable, so that the accuracy of the current-carrying capacity of the cable 100 to be tested at a subsequent test position can be ensured.
For example, the variation threshold may be considered a set value, i.e. may be selected according to actual requirements. In the present embodiment, the variation threshold may be 0.1%.
Step 308: and judging whether the temperature of the cable 100 to be tested reaches the maximum allowable temperature or not, and if the temperature of the cable 100 to be tested reaches the maximum allowable temperature, determining the current value at the moment as the current-carrying capacity of the cable 100 to be tested. If the temperature of the cable 100 to be tested does not reach the maximum allowable temperature, the current value carried by the cable 100 to be tested is continuously increased, i.e. step 206 is executed.
Through the step 308, it can be further ensured that the temperature of the cable 100 to be tested reaches the maximum allowable temperature, so that the current value borne by the cable 100 to be tested, that is, the current-carrying capacity of the cable 100 to be tested, can be ensured, and the reliability of the testing method is improved.
The invention has the following advantages:
(1) the embodiment of the disclosure utilizes LabVIEW software program control to build a test platform. The test platform has high automation degree, saves human resources, reduces the test cost and improves the test efficiency.
(2) The test platform provided by the embodiment of the disclosure comprehensively considers influence factors such as seawater 12 pressure, seawater 12 temperature, laying depth, wind speed in the calandria 4 and the like, can simulate actual complex working conditions more reasonably, and enables test results to be more reasonable and accurate.
(3) The test platform provided by the embodiment of the disclosure can simultaneously test the laying of the submarine section and the laying of the landing section of the submarine cable.
The above description is meant to be illustrative of the principles of the present disclosure and not to be taken in a limiting sense, and any modifications, equivalents, improvements and the like that are within the spirit and scope of the present disclosure are intended to be included therein.
Claims (10)
1. The utility model provides a test platform of submarine cable temperature field ampacity which characterized in that includes:
the cable testing device comprises a water tank, a testing device and a testing device, wherein soil and seawater are arranged in the water tank, the soil is positioned at the bottom of the water tank, at least one pair of jacks for inserting a cable to be tested are arranged at the position, corresponding to the soil, of the bottom of the water tank, and the seawater is positioned between the top of the soil and the inner wall of the top of the water tank;
the output end of the booster pump is positioned between the top of the soil and the inner wall of the top of the water tank;
a heater located in the seawater;
the calandria is used for being sleeved on the cable to be tested;
the large-current generator is used for being electrically connected with the cable to be tested;
the first optical fiber sensor is positioned in the cable to be measured and in the soil, and is used for measuring the temperature and the pressure of the cable to be measured in the soil;
a second fiber optic sensor located in the seawater for measuring temperature and pressure in the seawater;
and the third optical fiber sensor is positioned in the cable to be tested and in the calandria, and is used for measuring the temperature and the pressure of the cable to be tested in the calandria.
2. The test platform as claimed in claim 1, wherein the bottom of the water tank has a plurality of pairs of insertion holes for inserting the cables to be tested at positions corresponding to the soil, the axes of each pair of insertion holes are parallel to each other, and each pair of insertion holes are sequentially arranged along a direction perpendicular to a horizontal plane.
3. The test platform of claim 1, further comprising a main optical fiber, wherein the main optical fiber and the cable under test are laid together, and wherein the first optical fiber sensor, the second optical fiber sensor and the third optical fiber sensor are all connected to the main optical fiber.
4. The test platform of claim 1, further comprising a fan for blowing air into the interior of the bank pipe.
5. The test platform of claim 4, wherein the fan is a centrifugal fan, and an air outlet of the fan is in communication with an end opening of the bank pipe.
6. A method for testing the current carrying capacity of a submarine cable in a temperature field, which is characterized in that the method is based on the test platform of any one of claims 1 to 5, and the method comprises the following steps:
penetrating the cable to be tested through the jack to be laid in soil;
sleeving the calandria on the cable to be tested outside the water tank;
determining the working condition pressure and the working condition temperature of the cable;
the pressure of the seawater is boosted to the working condition pressure of the cable by the booster pump, and the temperature of the seawater is increased to the working condition temperature of the cable by the heater;
and increasing the current value borne by the cable to be tested through the large current generator until the temperature of the cable to be tested is increased to the maximum allowable temperature, and determining the current value at the moment as the current-carrying capacity of the cable to be tested.
7. The method of claim 6, wherein said passing the cable under test through a receptacle for laying in the earth comprises:
providing a plurality of cables to be tested;
and respectively penetrating the cables to be tested through different jacks, so that the parts of the cables to be tested in the water tank are mutually spaced and parallel, and the arrangement direction of the cables to be tested is vertical to the horizontal plane.
8. The method of testing of claim 7, wherein said providing a plurality of cables under test comprises:
and providing a plurality of cables to be tested with different lengths.
9. The testing method of claim 6, further comprising:
mounting a fan to a position proximate to the bank pipe such that an air outlet of the fan is open to an end of the bank pipe;
determining the working condition and wind speed of the cable;
and adjusting the wind speed in the calandria to the working condition wind speed of the cable through the fan.
10. The testing method of claim 6, wherein after increasing the value of the current carried by the cable under test by the high current generator, the testing method further comprises:
and if the change rate of the temperature of the cable to be tested in each hour is greater than the change threshold, continuously increasing the current value borne by the cable to be tested until the temperature of the cable to be tested is increased to the maximum allowable temperature.
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